Effect of working fluid and filling ratio on performance of a closed loop pulsating heat pipe

This paper presents preliminary experimental results on thermal performance of a closed loop pulsating heat pipe (clphp) using copper tube having internal and external diameter with 2 mm and 3 mm respectively. for the experimentation,filling ratio (fr) was varied from 30 % to 70% with 10% increments,four turns and different heat inputs of 10 to 22 w(watts) is supplied to php’s. the position of the php’s was vertical bottom heat mode. the length of evaporator,adiabatic and condenser section was maintained 55,80,and 50 mm respectively. the working fluids are selected as acetone,methanol,ethanol,ccl4 (carbon tetrachloride),and benzene. in this study,characteristics of the thermal resistance and average evaporator temperatures at different heat input for various working fluids have been determined. the result shows that,the thermal resistance decreases rapidly with the increase of the heating input from 10 to 22 w. further,slowly was extended on different working fluids as mentioned. from the experimental results,acetone was found to be better working fluid as compared to other fluids. © school of engineering,taylor’s university.